Discord replacing the third is the saddest. It completely isn't fit for purpose. Part of the reason you can't find anything on Google now is that forums died, and Discord is unsearchable.
Discord just switches it's business model yearly to clone the one thing it hasn't killed yet. Started out to kill TS and IRC, then went on to kill the forum, then it tried to kill Steam/GOG but failed, now it's trying to kill Patreon.